Lesbianism in erotica deals with depictions in the visual arts of lesbianism, which is the expression of female-to-female sexuality. Some people get sexual pleasure by inserting objects, such porn milf as urethral sounds, into the urethra , a practice known as urethral play or sounding. Among fetishists, the pose of reluctance—the victimization of the cuckold—is a major element of the paraphilia. Breeding is sometimes followed by felching, which involves sucking the semen from the partner anus. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. Many transgender people regard the term shemale as offensive, arguing that it mocks or shows a lack of respect towards the gender identity and gender expression of transgender individuals; in this view, the term emphasizes the biological sex of a person and neglects their gender. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. It therefore has the connotation of being wild, dangerous, and fun. The gay cock mouth was the most common area to be ejaculated upon. Some pornographic films use an artificial hentai porn semen substitute to simulate or enhance creampie shots. Milking pornography features lactating women being milked or milking themselves . Positions can also be chosen specifically for added effects such as increased humiliation, elevation and suspension. A heterosexual threesome may involve two men and a woman, or one man and two women - that is, two men having sex with a woman , or two women with a man. The term comes from the French voyeur, one who looks. The consensual submission of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very short haircut or a bald head. Studies have found that masturbation is frequent in humans of both sexes and all ages, although there is variation. New swinging couples often choose a soft swap before they are comfortable with a full swap, although many couples stay soft swap for personal reasons.